JS Practice — Built-in Objects

Advanced — memoize

📖 Usage Example

const memoFib = memoize((n: number): number =>
  n <= 1 ? n : memoFib(n - 1) + memoFib(n - 2)
)
memoFib(10)   // → 55 (cached)

memoize wraps a function in a cache so repeated calls with the same argument skip recomputation.

Advanced: Generic Memoize

Challenge: Implement memoize<T extends unknown[], R>(fn: (...args: T) => R): (...args: T) => R caching results by serialized arguments.

const expensiveFn = memoize((n: number) => n * 2)
expensiveFn(5)  // → 10 (computed)
expensiveFn(5)  // → 10 (cached)

💡 Hints (1)